Thank you Daniel for your analyse. It’s strange, because there’s no NAT.

We force the RTPProxy in order to bypass routing issue in this call-flow, but both platform are reachable with public IP address.

I will look at the old SER and see why he does fix_nated_contact().

Regards,

Igor.

Hello,

Thank you for your reply. Indeed, I think that R-URI contains the kamailio address.

The old ser should not do fix_nated_contact() for traffic comming from kamailio. It is not in the position to figure out the address of the nat router. That is done by kamailio (which should use anyhow add_contact_alias(), because it is a better alternative for nat fixing).

Cheers,
Daniel

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